| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fraudulent command from being executed in a memory chip supporting a serial interface without delaying the execution of a normal command in a control device for a game machine.SOLUTION: A fraudulent command detection circuit 38 is provided which is connected in parallel to a serial signal line 36c and monitors a command input to a memory chip 33. When a fraudulent command is input to the memory chip 33, a bit pattern included in the fraudulent command is detected by the fraudulent command detection circuit 38, and a prescribed terminal of the memory chip 33 is controlled by a latch circuit until a prescribed trigger occurs. Thus the memory chip is disabled so as to prevent an execution of the fraudulent command in the memory chip 33.SELECTED DRAWING: Figure 6 |
